How large is the difference between the initial value (get_position()) and the final value (alvo) of the tween? If it is too small you may not notice the effect at all. Same for the duration: given how short it is (0.2) it might happen to fast to notice.
Alternatively you can create the bounce-effect yourself by chaining the interpolations using the (optional) delay-parameter of interpolate_property:
Your upload contains the already compiled project. Simply zip the directory containing your project as is. Do not export the project (using Project > Export) to a zip-file.